"Caught In The Hedge": Easy full health objective:
On level 4, "Caught In The Hedge", there is a beat the level with
full health objective. To accomplish this, switch to the CPU at the
very end of the level. They will have taken no damage and have full
health.

DreamWorks game references:
After completing "Projector Heist", go by the tree stump in the
woods. The two possums will be watching Shrek Super Slam on the film
projector.

The projector and laptop show different DreamWorks video game
screens. The laptop always shows Shrek Super Slam. The projector is
different, however. From when you first get the projector until
about half way through, Shrek Super Slam is on the screen. From
about halfway through the game until just before you play the final
level, it plays Shark Tale. After you play the last level it will
show Madagascar. However, even though they show the video games the
animals sitting next to the projector will talk as if they were
watching the actual movie.

Bonuses:
Complete the indicated number of objectives to unlock the
corresponding bonus.
Finishing Moves attack: 20 objectives
Ground Pound attack: 50 objectives
Bumper Carts 1 mini-game: 15 objectives
Bumper Carts 2 mini-game: 45 objectives
Race Track 1 mini-game: 25 objectives
Race Track 2 mini-game: 60 objectives
Range Driver 1 mini-game: 10 objectives
Range Driver 2 mini-game: 40 objectives